EP1377811B1 - Split focusing cytometer - Google Patents

Split focusing cytometer Download PDF

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Publication number
EP1377811B1
EP1377811B1 EP02719428A EP02719428A EP1377811B1 EP 1377811 B1 EP1377811 B1 EP 1377811B1 EP 02719428 A EP02719428 A EP 02719428A EP 02719428 A EP02719428 A EP 02719428A EP 1377811 B1 EP1377811 B1 EP 1377811B1
Authority
EP
European Patent Office
Prior art keywords
fluid
sample
reagent
inlet
channel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP02719428A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1377811A2 (en
Inventor
Bernard H. Weigl
Ronald L. Bardell
C. Frederick Battrell
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Micronics Inc
Original Assignee
Micronics Inc
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Filing date
Publication date
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Publication of EP1377811A2 publication Critical patent/EP1377811A2/en
Application granted granted Critical
Publication of EP1377811B1 publication Critical patent/EP1377811B1/en
Anticipated expiration legal-status Critical
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    • G01N15/05—Investigating sedimentation of particle suspensions in blood
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    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
    • G01N1/40—Concentrating samples
    • G01N1/4055—Concentrating samples by solubility techniques
    • G01N2001/4061—Solvent extraction
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
    • G01N1/40—Concentrating samples
    • G01N1/4077—Concentrating samples by other techniques involving separation of suspended solids
    • G01N2001/4094—Concentrating samples by other techniques involving separation of suspended solids using ultrasound
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/02—Investigating particle size or size distribution
    • G01N2015/0288—Sorting the particles
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/10—Investigating individual particles
    • G01N15/14—Optical investigation techniques, e.g. flow cytometry
    • G01N15/1404—Handling flow, e.g. hydrodynamic focusing
    • G01N15/1409—Handling samples, e.g. injecting samples
    • G01N2015/1411—Features of sheath fluids
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/10—Investigating individual particles
    • G01N15/14—Optical investigation techniques, e.g. flow cytometry
    • G01N15/1404—Handling flow, e.g. hydrodynamic focusing
    • G01N2015/1413—Hydrodynamic focussing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/10—Investigating individual particles
    • G01N15/14—Optical investigation techniques, e.g. flow cytometry
    • G01N15/1434—Optical arrangements
    • G01N2015/144—Imaging characterised by its optical setup
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/10—Investigating individual particles
    • G01N15/14—Optical investigation techniques, e.g. flow cytometry
    • G01N2015/1486—Counting the particles
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N35/00—Automatic analysis not limited to methods or materials provided for in any single one of groups G01N1/00 - G01N33/00; Handling materials therefor
    • G01N2035/00178—Special arrangements of analysers
    • G01N2035/00237—Handling microquantities of analyte, e.g. microvalves, capillary networks
    • G01N2035/00247—Microvalves
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T436/00—Chemistry: analytical and immunological testing
    • Y10T436/25—Chemistry: analytical and immunological testing including sample preparation
    • Y10T436/25375—Liberation or purification of sample or separation of material from a sample [e.g., filtering, centrifuging, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T436/00—Chemistry: analytical and immunological testing
    • Y10T436/25—Chemistry: analytical and immunological testing including sample preparation
    • Y10T436/2575—Volumetric liquid transfer

Definitions

  • This invention relates generally to microfluidic devices for performing analytic testing, and, in particular, to a microcytometer which combines the functions of chemical reaction and particle focusing into a single structure.
  • Microfluidic devices have recently become popular for performing analytic testing. Using tools developed by the semiconductor industry to miniaturize electronics, it has become possible to fabricate intricate fluid systems which can be inexpensively means produced. Systems have been developed to perform a variety of analytical techniques for the acquisition of information for the medical field.
  • Microfluidic devices may be constructed in a multi-layer laminated structure where each layer has channels and structures fabricated from a laminate material to form microscale voids or channels where fluid flow.
  • a microscale channel is generally defined as a fluid passage which has at least one internal cross-sectional dimension that is less than 500 ⁇ m and typically between about 0.1 ⁇ m and about 500 ⁇ m. The control and pumping of fluids through these channels is affected by either external pressurized fluid forced into the laminate, or by structures located within the laminate.
  • U.S. Patent No. 5,716,852 teaches a method for analyzing the presence and concentration of small particles in a flow cell using diffusion principles.
  • This patent discloses a channel cell system for detecting the presence of analyte particles in a sample stream using a laminar flow channel having at least two inlet means which provide an indicator stream and a sample stream, where the laminar flow channel has a depth sufficiently small to allow laminar flow of the streams and length sufficient to allow diffusion of particles of the analyte into the indicator stream to form a detection area, and having an outlet out of the channel to form a single mixed stream.
  • This device which is known at a T-Sensor, may contain an external detecting means for detecting changes in the indicator stream.
  • This detecting means may be provided by any means known in the art, including optical means such as optical spectroscopy, or absorption spectroscopy of fluorescence.
  • U.S. Patent No. 5,932,100 which patent is also incorporated herein by reference, teaches another method for analyzing particles within microfluidic channels using diffusion principles.
  • a mixture of particles suspended in a sample stream enters an extraction channel from one upper arm of a structure, which comprises microchannels in the shape of an "H".
  • An extraction stream (a dilution stream) enters from the lower arm on the same side of the extraction channel and due to the size of the microfluidic extraction channel, the flow is laminar and the streams do not mix.
  • the sample stream exits as a by-product stream at the upper arm at the end of the extraction channel, while the extraction stream exits as a product stream at the lower arm.
  • particles having a greater diffusion coefficient small particles such as albumin, sugars, and small ions
  • the larger particles blood cells
  • Particles in the exiting extraction stream (now called the product stream) may be analyzed without interference from the larger particles.
  • This microfluidic structure commonly known as an "H-Filter,” can be used for extracting desired particles from a sample stream containing those particles.
  • Flow cytometry is a sensitive and versatile probe of the optical characteristics of microscopic biological particles, with widespread applications including hematology, immunology, genetics, food science, pharmacology, microbiology, parasitology and oncology.
  • Optical flow cytometers use light scattering and fluorescence to determine physical and chemical properties of the particles.
  • particles are arranged in single file, typically by hydrodynamic focusing within a sheath fluid, and interrogated by a light beam propagating orthogonal to the flow axis. Scattered light is measured in a near forward direction by a photodetector.
  • a second photodetector is often positioned at 90° to the forward scattering direction to collect large angle scattering and fluorescence.
  • the top and bottom walls of the channel are silicon nitride/silicon dioxide windows for 90° light collection.
  • Each window is fabricated by growing an oxide layer on a silicon wafer, bonding the oxide layer to a second silicon wafer, etching away the silicon on both sides of the oxide at the window region and depositing a nitride layer.
  • Sobek et al. [Proceedings of the Solid-State Sensors and Actuators Workshop, Hilton Head, S.C., June 1994 ] describe a sheath flow channel fabricated between tow fused silica wafers. To couple light into the channel and out in the forward direction, optical fibers are sandwiched between the wafers orthogonal to the flow axis. Fluorescence is collected through the upper transparent wafer.
  • U.S. Patent No. 5,726,751 describes a silicon microchannel optical flow cytometer. This cytometer uses two components: a flow cytometer optical head and disposable flow module.
  • the flow module utilizes a V-groove flow channel micromachined in a silicon wafer.
  • the optical head comprises a laser to provide as illuminating beam and a small and large angle photodetectors.
  • U.S. Patent No. 5,561,517 describes a device for flow type particle image analysis in which, for any given sample to be analyzed, a timing signal for the light emission of a pulse light source is generated in every field image reading out period.
  • U.S. Patent No. 5,728,582 describes a type particle image analysis method and apparatus which facilitates the correlation between particles obtained by a particle detection unit and particle images obtained by a particle image pick-up unit.
  • WO 99/60397 A discloses an apparatus for storing a particle-containing liquid by means of a plurality of particle capture regions as well as a microfluidic analysis cartridge.
  • a sample fluid is first passed through a junction where it is mixed with a lysis reagent and then to a focussing means where it is focused in two dimensions, widthwise and depthwise, between the streams of a sheath fluid.
  • Cartridge 10 contains a whole blood inlet 12 which is coupled to a channel 14.
  • a lyse inlet 16 is coupled to a channel 18.
  • Channels 14 and 18 come together at a lyse injector 20.
  • the output of lyse injector 20 is connected to a lyse channel 22.
  • a sheath inlet 24 is coupled to a channel 26 which meets up with lyse channel 22 at a focusing chamber 28.
  • the output of chamber 28 leads into a cytometer channel 30 where the cells are interrogated.
  • Channel 30 is coupled to an exit channel 32 which leads to a waste chamber 34.
  • a sample 50 of whole blood is loaded into inlet 12, where it travels through channel 14.
  • a lyse reagent 52 such as regular water, is loaded into inlet 16 where it travels through channel 18.
  • the whole blood sample 50 is surrounded by lyse reagent 52 and focused into a thin ribbon 54, as can be seen in FIGS. 2 and 3 .
  • ribbon 54 is formed.
  • the red blood cells within sample 50 rupture, leaving the white blood cells to continue on into lyse channel 22.
  • Ribbon 54 is also geometrically focused when leaving injector 20, as the entrance 56 to channel 22 is narrower than the passageway through injector 20.
  • Ribbon 54 consisting of white blood cells travels through channel 22 to focusing chamber 28.
  • a sheath fluid which may be a solution such as phosphate buffered saline, which has been loaded into inlet 24 causes ribbon 54 to be focused such that a single file stream of white blood cells exits chamber 28 into cytometer channel 30.
  • ribbon 54 is narrowed until the stream of single file white blood cells is created.
  • the stream passes through a window 60 where a laser source 62 is focused, as can be seen in FIG. 4 .
  • a light scatter detector 64 counts and classifies the particles, as does a fluorescence detector 66.
  • the data accumulated by detectors 64 and 66 is stored for analysis.
  • the cells then pass through channel 32 into waste chamber 34.

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • General Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • Hematology (AREA)
  • Clinical Laboratory Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Pathology (AREA)
  • Biochemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Fluid Mechanics (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Public Health (AREA)
  • Emergency Medicine (AREA)
  • Vascular Medicine (AREA)
  • Anesthesiology (AREA)
  • Biomedical Technology (AREA)
  • Animal Behavior & Ethology (AREA)
  • Molecular Biology (AREA)
  • Urology & Nephrology (AREA)
  • Veterinary Medicine (AREA)
  • Automatic Analysis And Handling Materials Therefor (AREA)
  • Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
  • Investigating Or Analysing Biological Materials (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Sampling And Sample Adjustment (AREA)
  • External Artificial Organs (AREA)
  • Micro-Organisms Or Cultivation Processes Thereof (AREA)
  • Check Valves (AREA)
  • Multiple-Way Valves (AREA)
EP02719428A 2001-04-03 2002-04-03 Split focusing cytometer Expired - Lifetime EP1377811B1 (en)

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US28111401P 2001-04-03 2001-04-03
US281114P 2001-04-03
PCT/US2002/010508 WO2002082057A2 (en) 2001-04-03 2002-04-03 Split focusing cytometer

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US20020159920A1 (en) 2002-10-31
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WO2002081934A9 (en) 2002-11-28
WO2002082057A2 (en) 2002-10-17
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EP1377811A2 (en) 2004-01-07
WO2002081934A2 (en) 2002-10-17
US6674525B2 (en) 2004-01-06
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US20020149766A1 (en) 2002-10-17
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US20020160518A1 (en) 2002-10-31
US20020150502A1 (en) 2002-10-17

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